Is enhanced RTC supposed to work on PowerMac? When I compile with
CONFIG_RTC, the kernel doesn't boot up and dies when it hits the following
line:
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT);
in the function, __initfunc(int rtc_init(void)), in
linux/drivers/char/rtc.c.
I'm using 2.2.14 on PowerSurge board (UMAX S900).
I was looking at the linux/arch/ppc/kernel/pmac_time.c and prep_time.c.
And I noticed, that PReP machine uses CMOS_WRITE to access RTC, but
PowerMac uses cuda to access RTC instead of CMOS_WRITE. So I'm guessing
that enhanced RTC doesn't work on the PowerMacs, right now.
Naoki Takebayashi [off-list ref]
--- Dept. of Biology, Indiana University, Jordan Hall 142
--- 1001 E. Third St. Bloomington, IN 47405-3700 USA
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Naoki Takebayashi wrote:
Is enhanced RTC supposed to work on PowerMac? When I compile with
CONFIG_RTC, the kernel doesn't boot up and dies when it hits the following
line:
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT);
I have the same problem. I dont think it should work. (CMOS on a ppc?)
I have noticed that the 'clock' program seems to access the rtc. Assuming it
is, it may have the code we want to put in the kernel.
--
Joseph P. Garcia jpgarcia@execpc.com jpgarcia@lidar.ssec.wisc.edu
CS Undergraduate Student Employee - Systems Programmer
University of Wisconsin - Madison UW Lidar Group
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
On Wed, 5 Jan 2000, Naoki Takebayashi wrote:
Is enhanced RTC supposed to work on PowerMac? When I compile with
CONFIG_RTC, the kernel doesn't boot up and dies when it hits the following
line:
/* Initialize periodic freq. to CMOS reset default, which is 1024Hz */
CMOS_WRITE(((CMOS_READ(RTC_FREQ_SELECT) & 0xF0) | 0x06), RTC_FREQ_SELECT);
in the function, __initfunc(int rtc_init(void)), in
linux/drivers/char/rtc.c.
I'm using 2.2.14 on PowerSurge board (UMAX S900).
I was looking at the linux/arch/ppc/kernel/pmac_time.c and prep_time.c.
And I noticed, that PReP machine uses CMOS_WRITE to access RTC, but
PowerMac uses cuda to access RTC instead of CMOS_WRITE. So I'm guessing
that enhanced RTC doesn't work on the PowerMacs, right now.
To use enhanced RTC (/dev/rtc) on anything without a PC RTC, you have to write
a specific driver for your hardware first.
Gr{oetje,eeting}s,
--
Geert Uytterhoeven -- Linux/{m68k~Amiga,PPC~CHRP} -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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